CN216933371U

CN216933371U - Blood vessel thrombus taking catheter

Info

Publication number: CN216933371U
Application number: CN202220087864.1U
Authority: CN
Inventors: 司逸; 卢山; 阚远晴; 郭大乔; 符伟国
Original assignee: Zhongshan Hospital Fudan University
Current assignee: Zhongshan Hospital Fudan University
Priority date: 2022-01-14
Filing date: 2022-01-14
Publication date: 2022-07-12
Anticipated expiration: 2032-01-14

Abstract

The utility model relates to a vessel thrombus taking catheter, belonging to the technical field of vessel surgical tools. A blood vessel thrombus removal catheter comprises a blocking sheath and a thrombus removal device; the blocking sheath comprises an outer sheath tube, the far end of the outer sheath tube is provided with a balloon, and an axially extending liquid injection cavity and a guide wire cavity are arranged in parallel inside the outer sheath tube; the far end of the liquid injection cavity is communicated with the balloon, and the near end of the liquid injection cavity is communicated with the liquid injection port; the two ends of the guide wire cavity are open, and a guide wire passage extending along the axial direction of the blood vessel is provided; the thrombus removal device comprises a thrombus removal device, a conveying sheath, a thrombus protection umbrella and a thrombus removal guide wire, wherein the thrombus protection umbrella and the thrombus removal device are arranged at the far end of the thrombus removal guide wire, and the conveying sheath is arranged outside the thrombus removal guide wire, can be fixed or peeled off from the thrombus removal guide wire and simultaneously penetrates through the guide wire cavity.

Description

Blood vessel thrombus taking catheter

Technical Field

The utility model relates to a vessel thrombus taking catheter, belonging to the technical field of vessel surgical tools.

Background

Peripheral vascular thromboembolic diseases are a common frequently encountered disease at present, and mainly comprise venous thromboembolism, arterial embolism and arterial thrombosis. The lower limb deep vein thrombosis causes limb swelling pain and dysfunction, even ulcer necrosis, and the risk of pulmonary artery embolism caused by secondary thrombus shedding exists, so that the life can be endangered; acute lower limb arterial embolism and thrombosis cause the onset/deterioration of limb acute ischemia and claudication, and if not timely treated, the acute consequences of late amputation and even death can be caused.

The current treatment methods for peripheral vascular thromboembolic diseases mainly comprise vascular incision embolectomy, interventional catheterization and thrombolysis, and interventional catheter embolectomy. Although the thrombus removal effect is positive, the method needs to dissect and separate and cut the blood vessel, and has the defects of restenosis of blood vessel suture, infection of incision, slow recovery after operation and the like, and the operation treatment mode is gradually replaced by minimally invasive intracavity treatment. The interventional catheterization thrombolysis has good thrombolysis effect, but the treatment method has strict indication requirements due to high hemorrhagic risk of thrombolysis drugs, and cannot generally benefit patient groups.

At present, most of interventional catheter embolectomy adopts a stent type embolectomy device or a balloon type embolectomy device, a blood vessel is cut near a body part of a patient forming thrombus, a embolectomy catheter is inserted and passes through a clot part along the blood vessel, a stent is released or a balloon device is inflated to open, and a coagulated blood clot is brought out by drawing out the embolectomy device.

However, in the actual operation process, the force applied on the thrombus by the stent-type thrombus extractor is not uniform, so that the thrombus is easy to fall off from the thrombus extractor, or the thrombus is cut by a stent guide wire during the recovery process of the thrombus extractor to form fragments which escape with the blood flow, so that the far-end blood vessel is embolized. The balloon type embolectomy device has certain safety limit due to the internal pressure of the balloon, the expansion radius of the balloon is very limited, and a good airtight contact effect is difficult to form between the balloon type embolectomy device and the vessel wall; and when a balloon type embolectomy device is used for embolectomy, the blockage of blood flow by the expansion balloon also causes temporary ischemia of the far-end tissue.

Disclosure of Invention

The utility model aims to provide a vessel thrombus taking catheter, which is particularly suitable for treating peripheral vessel thromboembolic diseases, can ensure firm grasping and fixing of thrombus and effectively prevent the escape of the thrombus.

The utility model adopts the following technical scheme:

a blood vessel thrombus removal catheter comprises a blocking sheath and a thrombus removal device; the blocking sheath comprises an outer sheath tube 7, the far end of the outer sheath tube 7 is provided with a saccule 6, and an axially extending liquid injection cavity and a guide wire cavity are arranged in parallel inside the outer sheath tube 7; the far end of the liquid injection cavity is communicated with the balloon 6, and the near end of the liquid injection cavity is communicated with the liquid injection port; the two ends of the guide wire cavity are open, and a guide wire passage extending along the axial direction of the blood vessel is provided; the thrombus taking device comprises a thrombus taking device 3, a conveying sheath 5, a thrombus protecting umbrella and a thrombus taking guide wire 4, wherein the thrombus protecting umbrella and the thrombus taking device 3 are arranged at the far end of the thrombus taking guide wire, and the conveying sheath 5 is sleeved outside the thrombus taking guide wire 4, can be fixed or peeled off from the thrombus taking guide wire 4 and is simultaneously arranged in the guide wire cavity in a penetrating manner.

Preferably, a coil of radiopaque spring is provided at the distal end of the outer sheath tube 7 where it joins the balloon as a visualization marker during the procedure.

Preferably, the distal and proximal segments of the embolectomy device 3 each have 1 site of a platinum visualization marker.

Preferably, the thrombus protection umbrella also comprises a thrombus protection filter screen 2, and a radiopaque spring coil end 1 for developing tracing is arranged at the distal end head of the thrombus protection filter screen.

Further, the thrombus protection screen 2 has a characteristic heparin coating on its surface intended to remain open during screen deployment.

Preferably, the bolt extractor 3 is a double-layer basket structure and has a multi-section open-loop outer frame structure and a closed-loop inner channel, and the tail end of the bolt extractor 3 is of a closed-shaped structure.

Preferably, the liquid injection port is arranged on the balloon filling joint 8 at the proximal end of the outer sheath tube 7.

The utility model has the beneficial effects that:

1) the blood flow blocking device, the thrombus protection umbrella and the double-layer basket structure thrombus extractor are comprehensively utilized, so that the recanalization rate of the thrombus extraction device is improved, and the risk of thrombus escape is reduced;

2) the blood flow blocking device is placed at the proximal segment of the vascular lesion, and the balloon is inflated before the blood vessel protective umbrella and the thrombus remover are released to temporarily block upstream blood flow, so that the risk of thrombus or plaque falling when the thrombus removing catheter passes through the lesion part due to blood flow impact is reduced;

3) the thrombus umbrella is of a closed loop structure, so that the capability of the thrombus umbrella for traversing the tortuous vessel anatomical structure can be improved; the thrombus protection umbrella can prevent thrombus escaping from the upstream or generated fragments from being intercepted during thrombus taking, so that the thrombus is prevented from falling to cause embolism of a far-end blood vessel, and meanwhile, the filter screen allows a small amount of blood to flow so as to reduce the influence of blood flow blockage on the body.

4) The bolt taking device adopts a double-layer basket structure, the outer layer is a multi-section open-loop outer frame, and the inner layer is a closed-loop channel. The outer frame adopts the open-loop design, has a plurality of big opening meshes, and the reinforcing is got the gomphosis power of thrombus ware to the thrombus, can effectively prevent the thrombus and drop the emergence, improves the thrombus and snatchs the effect.

5) The outer frame of the thrombus extraction device adopts a multi-section design, so that the adherence of the thrombus extraction device to a bent blood vessel is better, the adherence can be always kept when the thrombus extraction device is withdrawn, and the thrombus fixing effect is improved. The closed-loop inner channel can fix thrombus between the baskets on the two sides through closed-loop compact meshes on one hand, and on the other hand, the closed-loop inner channel can restore forward blood flow, so that the influence of blood flow blockage on an organism is reduced.

6) The double-layer basket structure adopts a closed design at the tail end of the thrombus extractor, so that the thrombus is controlled when the thrombus extractor withdraws, and the risk of thrombus escape is reduced.

7) The stripping type delivery sheath is adopted, the guide wire can be fixed when the blood vessel protective umbrella and the thrombus remover are released, and meanwhile, the delivery sheath is directly torn off. Therefore, the guide wire does not need to penetrate through the conveying sheath from the beginning, the working range of operators is shortened, the operation process is more convenient, and doctors can finish embolectomy operation independently without the cooperation of auxiliary personnel.

Drawings

Fig. 1 is a structural schematic diagram of a vascular thrombus removal catheter of the present invention.

FIG. 2 is a schematic view of a thrombus-retaining umbrella.

Fig. 3 is a schematic view of a embolectomy device.

FIG. 4 is a schematic view of a first step in the operation of the catheter for removing thrombi from blood vessel.

FIG. 5 is a schematic diagram of a second step in the operation of the vessel thrombectomy catheter.

Fig. 6 is a schematic diagram of a third step in the operation of the blood vessel thrombectomy catheter.

Fig. 7 is a schematic diagram of step four in the operation of the blood vessel embolectomy catheter.

Fig. 8 is a schematic diagram of the fifth step when the blood vessel thrombectomy catheter is operated.

Fig. 9 is a schematic diagram of a sixth step in the operation of the vascular embolectomy catheter.

It should be noted that fig. 4-9 are only simple schematic diagrams of the operation process, and the components shown, such as the bolt remover and the protective umbrella, are only schematic diagrams and do not conform to the shape and structure shown in fig. 1-3.

In the figure, 1 radiopaque spring coil end, 2 thrombus protection filter screens, 3 thrombus taking devices, 4 thrombus taking guide wires, 5 peeling type conveying sheaths, 6 saccules, 7 outer sheath tubes of blocking sheaths, 8 saccule filling joints, 9 peeling type conveying sheath near ends, 10 guide wire twisting controllers, 11 thrombus taking device closed tail ends, 12 thrombus taking device external frames, 13 thrombus taking device internal channels, 14 thrombus taking device far-end platinum developing marks, 15 thrombus taking device near-end platinum developing marks and 16 guide wires.

Detailed Description

The utility model is further described with reference to the following figures and specific examples.

As shown in figure 1, the thrombus removal catheter for treating the thromboembolic diseases of the peripheral blood vessels mainly comprises a blocking sheath and a thrombus removal device.

Two axially extending cavities, namely a liquid injection cavity and a guide wire cavity, exist in the outer sheath tube 7 of the blocking sheath, the far end of the liquid injection cavity is communicated with the inner cavity of the balloon 6, the near end of the liquid injection cavity is communicated with the balloon filling joint 8, and a user can inject liquid through the balloon filling joint 8 to enable the balloon to be filled and expanded. The guide wire cavity is open at both ends to provide a guide wire passage extending axially along the blood vessel.

The thrombus taking device mainly comprises a thrombus protection umbrella 2, a thrombus taking device 3, a conveying sheath 5 and a thrombus taking guide wire 4. As shown in fig. 2, the thrombus protection device is composed of a thrombus protection screen 2, and a radiopaque spring coil end 1 for visualization tracing is arranged at the distal end head part of the thrombus protection screen.

As shown in figure 3, the thrombus taking device 3 has a double-layer basket structure, the outer frame 12 is in an open-loop and multi-section design, and is provided with a plurality of large-opening meshes, so that the thrombus can be firmly grabbed into the outer frame, and the adherence can be kept when the thrombus taking device is withdrawn, and the thrombus can be fixed. The thrombus taking device inner channel 13 is designed to be closed loop, so that the thrombus can be kept embedded, and the forward blood flow can be recovered. In addition, the distal end of the thrombus remover is a closed tail end 11, so that the thrombus can be prevented from escaping. There are 2 platinum visualization markers 15 at the proximal end of the embolectomy device and 2 platinum visualization markers 14 at the distal end of the embolectomy device. The delivery sheath 5 is loaded with the thrombectomy guidewire 4 through the second lumen of the blocking sheath outer sheath tube 7, and the delivery sheath 5 remains fixed relative to the thrombectomy guidewire 4 during delivery of the guidewire.

When the delivery sheath 5 is retracted to release the thrombus protection filter screen 2 and the thrombus extractor 3, the guide wire twist controller 10 at the proximal end of the thrombus extraction guide wire 4 is screwed to fix the guide wire position, and then the proximal delivery sheath 9 is retracted and stripped, and the delivery sheath 5 and the thrombus extraction guide wire 4 move axially relative to each other.

The specific process of extracting thrombus in peripheral blood vessels by adopting the thrombus extraction catheter is as follows:

first, referring to fig. 4, after the position of thrombus and the condition of peripheral blood vessel are known by performing puncture intubation on blood vessel and by arteriography or venography, the blood vessel is punctured first and a guide wire is introduced to the proximal end of thrombus lesion.

Second, referring to fig. 5, the blocking sheath is introduced over the guide wire to the proximal end of the thrombus, the guide wire is withdrawn, and saline or other fluid is injected through the balloon inflation connection to inflate the balloon and temporarily block the upstream blood flow.

Thirdly, referring to fig. 1-3 and fig. 6, the delivery sheath 5 is loaded with the thrombectomy guide wire 4 and the thrombus protection screen 2 and the thrombectomy device 3 on the guide wire, and passes through the guide wire cavity of the outer sheath 7 of the blocking sheath to reach the proximal end of thrombus. Before the delivery sheath 5 passes through the lesion, the balloon 6 is inflated and expanded to cling to the vessel wall by injecting saline or other liquid into the balloon inflation connector 8, temporarily blocking upstream blood flow. Then the delivery sheath 5 is pushed to pass through the lesion part, the release position of the thrombus protection filter screen 2 is determined by the position relation between the spring coil end 1 which does not transmit money on the thrombus protection device and the distal end of the thrombus, and the release position of the embolectomy device 3 is determined by the position relation between the proximal platinum developing mark 15 and the distal platinum developing mark 14 of the embolectomy device and the thrombus.

Referring to fig. 1-3 and 7, the guidewire twister 10 is then tightened to fix the guidewire position, and the avulsion proximal delivery sheath 9 is withdrawn, releasing the thrombus protection screen 2 and the embolectomy device 3. When the thrombus taking device 3 is completely unfolded, thrombus is firmly grabbed, and the thrombus protection filter screen 2 is completely unfolded to be tightly attached to the vascular wall, the balloon 6 is loosened by sucking out normal saline or other liquid from the balloon filling connector 8, and the forward blood flow is recovered.

Referring to fig. 1-3 and 8, the guidewire twister 10 is then unscrewed, the proximal delivery sheath 9 is held and withdrawn, with the delivery sheath 5 and the embolectomy guidewire 4 fixed in position relative to each other, the embolectomy device 3 and the vascular protection screen 2 are withdrawn outside the body, and the captured thrombus or plaque is removed.

Referring to fig. 1-3 and 9, the outer sheath 7 of the blocking sheath is finally withdrawn outside the body, and the puncture site is pressed to stop bleeding.

While the preferred embodiments of the present invention have been described, those skilled in the art will appreciate that various changes and modifications can be made therein without departing from the spirit and scope of the utility model as defined by the appended claims.

Claims

1. A vessel thrombectomy catheter, which is characterized in that:

comprises a blocking sheath and a thrombus taking device;

the blocking sheath comprises an outer sheath tube (7), the far end of the outer sheath tube (7) is provided with a saccule (6), and an axially extending liquid injection cavity and a guide wire cavity are arranged in parallel in the blocking sheath; the far end of the liquid injection cavity is communicated with the balloon (6), and the near end of the liquid injection cavity is communicated with the liquid injection port; the two ends of the guide wire cavity are open, and a guide wire passage extending along the axial direction of the blood vessel is provided;

the thrombus taking device comprises a thrombus taking device (3), a conveying sheath (5), a thrombus protecting umbrella and a thrombus taking guide wire (4), wherein the thrombus protecting umbrella and the thrombus taking device (3) are arranged at the far end of the thrombus taking guide wire, and the conveying sheath (5) is sleeved outside the thrombus taking guide wire (4), can be fixed or peeled off from the thrombus taking guide wire (4) and simultaneously penetrates through the guide wire cavity.

2. The vessel embolectomy catheter of claim 1, wherein: a ring of radiopaque spring coil is arranged at the joint of the far end of the outer sheath tube (7) and the saccule and is used as a developing mark in the operation process.

3. The vessel embolectomy catheter of claim 1, wherein: the far end and the near section of the thrombus taking device (3) are respectively provided with 1 platinum developing mark point.

4. The vessel embolectomy catheter of claim 1, wherein: the thrombus protection umbrella also comprises a thrombus protection filter screen (2) as a main body, and a radiopaque spring coil end (1) for developing tracing is arranged at the head part of the far end of the thrombus protection umbrella.

5. The vessel embolectomy catheter of claim 4, wherein: the thrombus protection screen (2) has a characteristic heparin coating on its surface intended to remain open during screen deployment.

6. The vessel embolectomy catheter of claim 1, wherein: the bolt taking device (3) is of a double-layer basket structure and is provided with a multi-section open-loop outer frame structure and a closed-loop inner channel, and the tail end of the bolt taking device (3) is of a closed structure.

7. The vessel embolectomy catheter of claim 1, wherein: the liquid injection port is arranged on the balloon filling joint (8) at the near end of the outer sheath tube (7).